Why You Have to Drink Fluid on Rides—Especially When It’s Hot

Imagine trying to ride your bike for two hours on a summer day without drinking any water. You might think, “I’ll be fine—it’s only a couple hours.” But here’s what really happens inside your body when you skip the bottle.

Your Body Gets Hot—and Starts to Struggle

When you ride, your muscles work hard and produce heat. Your body cools itself by sweating. That sweat? It’s made mostly of water and some salt. If you don’t drink water to replace what you lose, your body starts running low on fluids.

Dehydration Happens Fast

Even losing just 1–2% of your body weight in water can cause:

• Slower reaction time

• Muscle cramps

• Dizziness or headaches

• Increased heart rate

• Feeling super tired, super fast

It’s like trying to ride your bike with the brakes slightly on—and your brain can’t think clearly either. That slower reaction time and fatigue also make you much more likely to crash, especially on trails with roots, rocks, or close group riding.

Hot Weather Makes It Worse

In the heat, you sweat even more. That means you get dehydrated faster, and your body has to work extra hard just to stay cool. Without enough water, your sweat rate drops, and that means your body can’t cool itself anymore.

You might feel chilled or get goosebumps. That’s a warning sign: your body is overheated and starting to shut things down.

What Should You Do?

Bring a water bottle. Always. If it’s over 70°F, bring two. 

Drink every 10–15 minutes, even if you don’t feel thirsty. Your body needs it before you notice you’re low.

Bonus tip: Add electrolytes (like Nuun or Skratch) if you’re riding for over an hour in the heat. That helps your muscles keep firing.

Bottom Line

If you don’t drink, your performance drops, your body suffers, and your ride gets way less fun. Hydration is not optional—it’s fuel for your brain and muscles.

Be smart. Bring water. Drink it.